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A151589 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 8 adjacent element pairs in decreasing order. 0
0, 5, 105372, 92123514, 25367820672, 3777055329267 (list; graph; refs; listen; history; internal format)
OFFSET

4,2

CROSSREFS

Sequence in context: A145232 A123591 A133381 * A038027 A057679 A123751

Adjacent sequences:  A151586 A151587 A151588 * A151590 A151591 A151592

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) May 21 2009

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.